done

MathUtilities.java

@@ -11,7 +11,8 @@ public class MathUtilities {
     * @return sum of `baseValue` and `difference`
     */
    public Integer add(int baseValue, int difference) {
-       return null;
+       int add = baseValue + difference;
+       return add;
    }
 
    /**
@@ -20,7 +21,8 @@ public class MathUtilities {
     * @return sum of `baseValue` and `difference`
     */
    public Long add(long baseValue, long difference) {
-       return null;
+       long add = baseValue + difference;
+       return add;
    }
 
    /**
@@ -29,7 +31,8 @@ public class MathUtilities {
     * @return sum of `baseValue` and `difference`
     */
    public Short add(short baseValue, short difference) {
-       return null;
+       short add = (short) (baseValue + difference);
+       return add;
    }
 
    /**
@@ -38,7 +41,8 @@ public class MathUtilities {
     * @return sum of `baseValue` and `difference`
     */
    public Byte add(byte baseValue, byte difference) {
-       return null;
+       byte add = (byte) (baseValue + difference);
+       return add;
    }
 
    /**
@@ -47,7 +51,8 @@ public class MathUtilities {
     * @return sum of `baseValue` and `difference`
     */
    public Float add(float baseValue, float difference) {
-       return null;
+       float add = baseValue + difference;
+       return add;
    }
 
    /**
@@ -56,7 +61,8 @@ public class MathUtilities {
     * @return sum of `baseValue` and `difference`
     */
    public Double add(double baseValue, double difference) {
-       return null;
+       double add = baseValue + difference;
+       return add;
    }
 
    /**
@@ -65,7 +71,8 @@ public class MathUtilities {
     * @return difference between `baseValue` and `difference`
     */
    public Integer subtract(int baseValue, int difference) {
-       return null;
+       int subtract = baseValue - difference;
+       return subtract;
    }
 
    /**
@@ -74,7 +81,8 @@ public class MathUtilities {
     * @return difference between `baseValue` and `difference`
     */
    public Long subtract(long baseValue, long difference) {
-       return null;
+       long subtract = baseValue - difference;
+       return subtract;
    }
 
    /**
@@ -83,7 +91,8 @@ public class MathUtilities {
     * @return difference between `baseValue` and `difference`
     */
    public Short subtract(short baseValue, short difference) {
-       return null;
+       short subtract = (short) (baseValue - difference);
+       return subtract;
    }
 
    /**
@@ -92,7 +101,8 @@ public class MathUtilities {
     * @return difference between `baseValue` and `difference`
     */
    public Byte subtract(byte baseValue, byte difference) {
-       return null;
+       byte subtract = (byte) (baseValue - difference);
+       return subtract;
    }
 
    /**
@@ -101,7 +111,8 @@ public class MathUtilities {
     * @return difference between `baseValue` and `difference`
     */
    public Float subtract(float baseValue, float difference) {
-       return null;
+       float subtract = baseValue - difference;
+       return subtract;
    }
 
    /**
@@ -110,7 +121,8 @@ public class MathUtilities {
     * @return difference between `baseValue` and `difference`
     */
    public Double subtract(double baseValue, double difference) {
-       return null;
+       double subtract = baseValue - difference;
+       return subtract;
    }
 
 
@@ -120,7 +132,8 @@ public class MathUtilities {
     * @return division of `dividend` by `divisor
     */
    public Integer divide(int dividend, int divisor) {
-       return null;
+       int divide = dividend / divisor;
+       return divide;
    }
 
    /**
@@ -129,7 +142,8 @@ public class MathUtilities {
     * @return division of `dividend` by `divisor
     */
    public Long divide(long dividend, long divisor) {
-       return null;
+       long divide = dividend / divisor;
+       return divide;
    }
 
    /**
@@ -138,7 +152,8 @@ public class MathUtilities {
     * @return division of `dividend` by `divisor
     */
    public Short divide(short dividend, short divisor) {
-       return null;
+       short divide = (short) (dividend / divisor);
+       return divide;
    }
 
    /**
@@ -147,7 +162,8 @@ public class MathUtilities {
     * @return division of `dividend` by `divisor
     */
    public Byte divide(byte dividend, byte divisor) {
-       return null;
+       byte divide = (byte) (dividend / divisor);
+       return divide;
    }
 
    /**
@@ -156,7 +172,8 @@ public class MathUtilities {
     * @return division of `dividend` by `divisor
     */
    public Float divide(float dividend, float divisor) {
-       return null;
+       float divide = dividend / divisor;
+       return divide;
    }
 
    /**
@@ -165,7 +182,8 @@ public class MathUtilities {
     * @return division of `dividend` by `divisor
     */
    public Double divide(double dividend, double divisor) {
-       return null;
+       double divide = dividend / divisor;
+       return divide;
    }
 
 
@@ -175,7 +193,8 @@ public class MathUtilities {
     * @return product of `multiplicand` by `multiplier`
     */
    public Integer multiply(int multiplicand, int multiplier) {
-       return null;
+       int multiply = multiplicand * multiplier;
+       return multiply;
    }
 
    /**
@@ -184,7 +203,8 @@ public class MathUtilities {
     * @return product of `multiplicand` by `multiplier`
     */
    public Long multiply(long multiplicand, long multiplier) {
-       return null;
+       long multiply = multiplicand * multiplier;
+       return multiply;
    }
 
    /**
@@ -193,7 +213,9 @@ public class MathUtilities {
     * @return product of `multiplicand` by `multiplier`
     */
    public Short multiply(short multiplicand, short multiplier) {
-       return null;
+       short multiply = (short) (multiplicand * multiplier);
+       return multiply;
+
    }
    /**
     * @param multiplicand value to be multiplied
@@ -201,7 +223,8 @@ public class MathUtilities {
     * @return product of `multiplicand` by `multiplier`
     */
    public Byte multiply(byte multiplicand, byte multiplier) {
-       return null;
+       byte multiply = (byte) (multiplicand * multiplier);
+       return multiply;
    }
 
    /**
@@ -210,7 +233,8 @@ public class MathUtilities {
     * @return product of `multiplicand` by `multiplier`
     */
    public Float multiply(float multiplicand, float multiplier) {
-       return null;
+       float multiply = multiplicand * multiplier;
+       return multiply;
    }
 
    /**
@@ -219,7 +243,8 @@ public class MathUtilities {
     * @return product of `multiplicand` by `multiplier`
     */
    public Double multiply(double multiplicand, double multiplier) {
-       return null;
+       double multiply = multiplicand * multiplier;
+       return multiply;
    }
 
 
@@ -227,14 +252,14 @@ public class MathUtilities {
      * @return true
     */
    public Boolean returnTrue() {
-       return null;
+       return true;
    }
 
    /**
     * @return false
     */
    public Boolean returnFalse() {
-       return null;
+       return false;
    }
 
 }

PredicateUtilities.java

@@ -1,16 +1,18 @@
 
-
 /**
 * Created by dan on 6/14/17.
 */
-public class PredicateUtilities {
+public class PredicateUtilities extends PredicateUtilitiesTest {
    /**
     * @param x
     * @param y
     * @return true if `x` is greater than `y`
     */
    public Boolean isGreaterThan(int x, int y) {
-       return null;
+       if (x > y)
+       return true;
+       else
+       return false;
    }
 
    /**
@@ -19,7 +21,10 @@ public class PredicateUtilities {
     * @return true if `x` is less than `y`
     */
    public Boolean isLessThan(int x, int y) {
-       return null;
+       if (x < y)
+       return true;
+       else
+       return false;
    }
 
    /**
@@ -28,7 +33,10 @@ public class PredicateUtilities {
     * @return true if `x` is greater than or equal to `y`
     */
    public Boolean isGreaterThanOrEqualTo(int x, int y) {
-       return null;
+       if (x >= y)
+       return true;
+       else
+       return false;
    }
 
    /**
@@ -37,6 +45,9 @@ public class PredicateUtilities {
     * @return true if `x` is less than or equal to `y`
     */
    public Boolean isLessThanOrEqualTo(int x, int y) {
-       return null;
+       if (x <= y)
+       return true;
+       else
+       return false;
    }
-}
+}

StringUtilities.java

@@ -1,5 +1,4 @@
 
-
 /**
  * Created by dan on 6/14/17.
  */
@@ -8,7 +7,7 @@ public class StringUtilities {
      * @return `Hello World` as a string
      */
     public String getHelloWorld() {
-        return null;
+        return "Hello World";
     }
 
     /**
@@ -17,7 +16,7 @@ public class StringUtilities {
      * @return the concatenation of two strings, `firstSegment`, and `secondSegment`
      */
     public String concatenation(String firstSegment, String secondSegment){
-        return null;
+        return firstSegment + secondSegment;
     }
 
     /**
@@ -26,7 +25,7 @@ public class StringUtilities {
      * @return the concatenation of an integer, `firstSegment`, and a String, `secondSegment`
      */
     public String concatenation(int firstSegment, String secondSegment){
-        return null;
+       return firstSegment + secondSegment;
     }
 
     /**
@@ -34,7 +33,7 @@ public class StringUtilities {
      * @return the first 3 characters of `input`
      */
     public String getPrefix(String input){
-        return null;
+        return input.substring(0,3);
     }
 
     /**
@@ -42,7 +41,7 @@ public class StringUtilities {
      * @return the last 3 characters of `input`
      */
     public String getSuffix(String input){
-        return null;
+        return input.substring(input.length() - 3);
     }
 
     /**
@@ -51,7 +50,7 @@ public class StringUtilities {
      * @return the equivalence of two strings, `inputValue` and `comparableValue`
      */
     public Boolean compareTwoStrings(String inputValue, String comparableValue){
-        return null;
+        return inputValue.equals(comparableValue);
     }
 
     /**
@@ -59,7 +58,8 @@ public class StringUtilities {
      * @return the middle character of `inputValue`
      */
     public Character getMiddleCharacter(String inputValue){
-        return null;
+        int middleValue = (inputValue.length()-1) / 2;
+        return inputValue.charAt(middleValue);
     }
 
     /**
@@ -67,7 +67,8 @@ public class StringUtilities {
      * @return the first sequence of characters
      */
     public String getFirstWord(String spaceDelimitedString){
-        return null;
+        int index = spaceDelimitedString.indexOf(" ");
+        return spaceDelimitedString.substring(0, index);
     }
 
     /**
@@ -75,7 +76,8 @@ public class StringUtilities {
      * @return the second word of a string delimited by spaces.
      */
     public String getSecondWord(String spaceDelimitedString){
-        return null;
+        int index = spaceDelimitedString.indexOf(" ");
+        return spaceDelimitedString.substring(index);
     }
 
     /**
@@ -83,7 +85,8 @@ public class StringUtilities {
      * @return an identical string with characters in reverse order.
      */
     public String reverse(String stringToReverse){
-        return null;
+        StringBuilder reversedString = new StringBuilder(stringToReverse);
+        return reversedString.reverse().toString(); 
     }
 
     /**
@@ -91,7 +94,7 @@ public class StringUtilities {
      * @return an identical string with spaces removed.
      */
     public String removeWhitespace(String input){
-        return null;
+        return input.replaceAll(" ","");
     }
 
     /**
@@ -99,6 +102,6 @@ public class StringUtilities {
      * @return an identical string with spaces in the front and end removed.
      */
     public String trim(String input){
-        return null;
+        return input.trim();
     }
-}
+}

package.bluej

@@ -1,27 +1,27 @@
 #BlueJ package file
-dependency1.from=StringUtilitiesTest
-dependency1.to=StringUtilities
+dependency1.from=PredicateUtilitiesTest
+dependency1.to=PredicateUtilities
 dependency1.type=UsesDependency
-dependency2.from=PredicateUtilitiesTest
-dependency2.to=PredicateUtilities
+dependency2.from=MathUtilitiesTest
+dependency2.to=MathUtilities
 dependency2.type=UsesDependency
-dependency3.from=MathUtilitiesTest
-dependency3.to=MathUtilities
+dependency3.from=StringUtilitiesTest
+dependency3.to=StringUtilities
 dependency3.type=UsesDependency
-editor.fx.0.height=0
-editor.fx.0.width=0
-editor.fx.0.x=0
-editor.fx.0.y=0
+editor.fx.0.height=722
+editor.fx.0.width=800
+editor.fx.0.x=320
+editor.fx.0.y=51
 objectbench.height=145
-objectbench.width=776
-package.divider.horizontal=0.6
-package.divider.vertical=0.7195571955719557
-package.editor.height=383
-package.editor.width=674
-package.editor.x=29
-package.editor.y=132
-package.frame.height=600
-package.frame.width=800
+objectbench.width=334
+package.divider.horizontal=0.6003521126760564
+package.divider.vertical=0.7591125198098256
+package.editor.height=456
+package.editor.width=462
+package.editor.x=403
+package.editor.y=23
+package.frame.height=689
+package.frame.width=588
 package.numDependencies=3
 package.numTargets=6
 package.showExtends=true